body{
    margin: 0;
    padding: 0;

}
.left{
    width: 300px;
    height: 800px;
    padding: 0;
    margin: 0;

}
.left ul{
    width: 300px;
    height: 800px;
    padding: 0;
    margin: 0;
    margin-left: 50px;
}
.left ul li{
    list-style: none;
    width: 300px;
    height: 50px;
    padding: 0;
}
.left ul li a{
    text-decoration: none;
    font-family: 微软雅黑;
    font-size: 22px;
    color: blue;
}
h4{
    ext-decoration: none;
    font-family: 微软雅黑;
    font-size: 26px;
    margin: 0;
    padding: 0;
    color: black;
}